All GRE Subject Test: Chemistry Resources
Example Questions
Example Question #1 : Electrochemical, Environmental, And Other Analyses
Once a sample of DNA is isolated, it is loaded on an agarose electrophoresis gel, as shown below. Once the sample has run, where will the student find the DNA?
Possible Answers:
It is impossible to tell without knowing the charge of the DNA
Red section
Green section
It is impossible to tell without knowing the size of the DNA fragments
Correct answer:
Green section
Explanation:
DNA is negatively charged, so it will migrate toward the positive electrode during electrophoresis. As a result, it will migrate from the center line into the green region of the gel.
Gregory
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All GRE Subject Test: Chemistry Resources
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